Realistic 3 Bruteforcer

Ok, so I'm at the part where I found the directory where *****************/mem doesn't return a 404 error. Problem is, I cannot find out the file's name. I know the extension is probably txt from the hints people dropped in the forums. I've tried every single logical word, like transaction and transact but they don't work.

I'm getting desperate so I thought of writing a C++ program which cycles through an array with literally every single word that starts with "trans" and either returns a 404 error or opens a window if the URL is right.